JPS5844169B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device equipped with a control function to automatically properly heat an object to be heated. A high-frequency heating device that uses high-frequency heating to heat a heated object detects the temperature of the air flowing out of the heating chamber or the temperature of the air inside the heating chamber, indirectly detects the temperature of the heated object, and automatically controls the heating time. It has been invented.

This type of high-frequency heating device has the advantage that it does not damage the heated object compared to a contact type that uses a probe-shaped temperature sensing element to directly detect the temperature of the heated object. This is extremely important as a heating device.

The general structure of this type of high-frequency heating device described above is described in the first section.
To explain with reference to the drawings, reference numeral 1 is a heating chamber of a high-frequency heating device that houses an object to be heated 2, and 3 is a door of the opening for storing and storing objects to be heated in the heating chamber 1.

As is well known, this door 3 is designed to prevent the high-frequency power supplied to the heating chamber 1 from leaking to the outside through the opening, and allows the inside of the heating chamber 1 to be observed if necessary. The finder is formed using a perforated metal plate, a transparent glass plate, etc.

4 is a plate on which the object to be heated 2 is placed.

Reference numeral 5 denotes an opening that shields the inside and outside of the heating chamber 1 from high frequency waves, but allows air to flow through. In this device, air flows through this opening.

Reference numeral 6 denotes an opening which shields the interior and exterior of the heating chamber 1 using high-frequency waves, as described above, to allow air to flow therethrough, and in this device, air flows out from here.

Reference numeral 7 denotes a blower device that forcibly causes the above-mentioned air flow, and exhausts the exhaust gas to the outside of the high-frequency heating device through an exhaust path 8.

A magnetron 9 generates high-frequency power, and is installed on the ceiling wall of the heating chamber 1 with an antenna protruding.

Although not shown in FIG. 1, the magnetron 9 is cooled by a dedicated cooling device.

Reference numerals 10 and 11 are openings that are connected to the openings 5 and 6 provided in the heating chamber 1, respectively, and are formed on the outermost side of the high-frequency heating device, and are provided in consideration of harmonizing with the other external appearance.

A partition plate 12 isolates the magnetron from the atmosphere inside the heating chamber 1, and is made of a material with low high frequency power loss.

Reference numerals 13 and 14 designate temperature sensing elements, such as thermistors, installed outside the openings 5 and 6 provided in the heating chamber 1, respectively, in portions that are not exposed to high frequency power.

These temperature sensing elements 13 and 14 are connected to the automatic control device 1.
5, and the automatic control device 15 receives a temperature signal of the air flowing into the heating chamber 1 from the temperature sensing element 13 and a signal flowing out from the heating chamber 1 from the temperature sensing element 14 when the high frequency heating device is activated. The temperature signal of the air that is
When the difference between the signal values of and 14 reaches a predetermined value, the power supply device 16 is controlled, thereby stopping the operation of the magnetron 9 and blower 7, and ending the high-frequency heating.

1γ is a guide for guiding the flow of air so that the air flowing into the heating chamber 1, circulating and flowing out comes into contact with the object to be heated 2 as much as possible, and also entrains the water vapor generated from the object to be heated 2. It is a board.

In this way, the high-frequency heating device detects the temperature rise of the air flowing out of the heating chamber 1 during high-frequency heating, indirectly detects the temperature of the heated object 2, and automatically controls the heating of the heated object. This eliminates the need for troublesome timer setting operations, and thus significantly improves the usability of the high-frequency heating device, but on the other hand, it also has some undesirable drawbacks.

In other words, when trying to perform highly accurate automatic control, heating chamber 1
Since the amount of air flowing through the heating chamber 1 must be reduced, the steam generated by the heated object 2 cannot be properly discharged to the outside of the heating chamber 1, and condensation often occurs on the heating chamber walls and the inside of the finder of the door 3. This may cause water to accumulate in the heating chamber 1 or impede the see-through function of the finder.

This phenomenon also occurs in the exhaust path 8.

This temperature rises due to both the temperature of the air flowing into the heating chamber 1 during high-frequency heating, the heat transfer from the heated object 2, and the water vapor generated from the heated object 2, which flows out of the heating chamber 1. This is because it is convenient for highly accurate automatic control to have as large a temperature difference as possible between the temperature of the air being heated and the temperature of the air flowing through the heating chamber 1. It arises from the fact that

Note that since the heating chamber wall and the finder of the door are not heated by high-frequency power during high-frequency heating, their temperature is usually lower than the atmospheric temperature in the heating chamber.

Therefore, even if the amount of water vapor in the atmosphere has not reached the saturation point, the portions that contact the heating chamber walls and the finder are always in a state of being easily saturated, and when the temperature of the air flowing into the heating chamber 1 is low, In the case of a heated object that generates a large amount of water vapor, dew condensation often occurs.

Further, when the temperature rise value of the air flowing out from the heating chamber 1 reaches a predetermined value and the operation of the magnetron 9 and the blower 7 is stopped, the atmosphere in the heating chamber is already in a state where it is easily saturated. Thereafter, the material remains in the heating chamber 1, and as the temperature continues to drop, condensation becomes more likely to form.

If such a phenomenon develops, water may overflow from the heating chamber and enter the power supply, creating an extremely dangerous situation.

This is a matter of concern as a product and must be eliminated.

However, from the standpoint of improving the accuracy of automatic control, condensation and improving accuracy are in a regressive relationship with each other, and therefore, it is extremely difficult to satisfy both.

That is, the amount of air that flows into the heating chamber 1, circulates, and flows out during high-frequency heating, and the temperature difference between the temperature of the inflowing air and the temperature of the air that is warmed by the object to be heated 2 and then flows out The relationship between air temperature rise (temperature rise value of air) tends to be as shown in Figure 2.

That is, if an attempt is made to prevent condensation of water vapor by increasing the amount of circulating air, a large temperature increase cannot be achieved, resulting in a decrease in detection accuracy.

Conversely, by reducing the amount of circulating air and increasing the temperature rise value,
If an attempt is made to increase the detection accuracy, dew condensation will occur on the walls of the heating chamber 1 and the like.

In addition, in the case of automatically controlling heating using temperature detection as described above, in the field of reheating, which only requires heating pre-cooked food to an edible temperature, the amount of steam generated from the heated food is Even if a large amount of However, when it is desired to maintain a certain temperature of a heated object for a certain period of time, condensation becomes a serious problem.

So, let's explain such a case using an actual example.

In other words, most potatoes maintain a temperature of about 60 to 70 degrees Celsius for a while while being heated and rising in temperature.
It is known that the most effective cooking method is to then raise the temperature to about 100°C, maintain that temperature for a while, and complete the gelatinization of beta starch in this state.

Therefore, the temperature detection mechanism of the high-frequency heating device is set so that the temperature of the potato, which is the object to be heated, is kept constant at a certain value of 60 to 70 degrees Celsius, and high-frequency heating is started. 0N- of the magnetron's oscillation operation according to the operation of
As the OFF cycle is repeated, if the amount of water vapor generated from the potatoes during this period exceeds the saturation point of the atmosphere in the heating chamber,
Or, even if the amount is not that great, if the heating chamber wall or viewfinder surface is quite cold, the water vapor in the atmosphere will quickly condense on the wall surface, leading to the above-mentioned problem condition. It is.

The present invention has been made in view of this situation, and is designed to prevent condensation from occurring even when high-frequency heating is performed by maintaining a certain temperature of a heated object for a certain period of time (hereinafter referred to as temperature holding). This is what I did.

To this end, the present invention increases or decreases the amount of air flowing through the heating chamber 1 during temperature maintenance, and occasionally exhausts the atmosphere in the heating chamber that tends to condense to the outside, even though it is convenient for temperature detection. Prevents condensation inside the heating chamber.

Specifically, as shown in FIG. 4, the amount of circulating air is increased and decreased alternately to prevent dew condensation within the heating chamber.

In the above-mentioned repeated cycle, since the upper limit T3 of the temperature of the potato, which is the object to be heated, is determined, when the temperature of the potato rises as shown in Figure 3 and reaches the upper limit T3, the temperature detection mechanism starts heating. Detecting the temperature rise value corresponding to the temperature of the potatoes in the air flowing out from the opening 6 of the chamber 1, the amount of air flowing in the heating chamber is immediately increased from Ql to Q2 as shown in FIG. 4, and the magnetron 90 Stop the oscillation operation,
The atmosphere in the heating chamber that is prone to condensation is exhausted, and then, sufficiently before the temperature of the potatoes reaches the lower limit T2, the amount of circulating air is returned to the original amount Q1, which is convenient for temperature detection, and the air flow in the heating chamber is changed to a steady flow. Then, the temperature of the potato is accurately reflected in the temperature rise value of the air flowing out from the opening 6 of the heating chamber, and from that point on, the temperature detection mechanism is activated to determine the lower limit T of the temperature of the potato.
When Q2 is detected, the automatic control device 15 controls the power supply device 16 again to increase the amount of circulating air from Q1 to Q2 and stop the oscillation operation of the magnetron 90.

The time t1 during which the amount of circulating air is increased Q2 depends on the volume of the heating chamber 1, but for example, in a heating chamber with a volume of 201,
If 2 = 1 m3/mvL, it is sufficient to continue for 3 to 4 seconds at most.

However, this value of 3 to 4 seconds means that the air in the heating chamber is
This is the time required to fully exhaust the air, and of course, it may vary depending on the structure of the heating chamber 1 being designed to take time to ventilate, or depending on the position of the air inflow and outflow openings 5 and 6. , it is necessary to increase the duration of the above.

When the atmosphere in the heating chamber is discharged by increasing the amount of circulating air Q2 as described above, the amount of circulating air decreases to the original Ql, and after a time t2 from that point, the temperature detection mechanism enters the temperature detection position, and the heating chamber The temperature rise value of the air flowing out from 1 decreases,
When a value corresponding to the lower limit T2 of the temperature of the potato, which is the object to be heated, is detected, the automatic control device 15 operates again to cause the magnetron 9 to oscillate.

As mentioned above, the time t2 means that the flow of air flowing through the heating chamber 1 becomes a steady flow convenient for temperature detection, and the temperature increase value of the air flowing out of the heating chamber 1 is This is sufficient time to accurately correspond to the temperature of the heated object.

This time t2 is the time from the time when the amount of circulating air returns to Ql from Q2, so it may be possible to start timing based on that point and treat it independently, but when the amount of circulating air becomes Q2, If the time t1 is a constant value for each cycle, it is often more convenient to treat it as the time t1+t2 from the time when the air amount increases from Ql to Q2, rather than treating it independently as above. .

Then, when the magnetron 9 starts oscillating, the temperature of the potato also starts to rise, and when that temperature reaches the upper limit T3, the temperature detection mechanism also detects the temperature rise value of the air flowing out of the heating chamber corresponding to that temperature, and the temperature is recirculated. The amount of air is increased to Q2 and the oscillation of the magnetron 9 is stopped.

Thereafter, high-frequency heating continues in this manner, and the temperature of the heated object is maintained.

FIGS. 5 and 6 show a high-frequency heating device of the present invention which accurately performs the above operations with a simple structure, and this device will be described in detail below.

Note that in FIGS. 5 and 6, the same reference numerals as in FIG. 1 represent the same parts, so a further explanation will not be given.

In these drawings, reference numeral 18 denotes a ceiling wall of the heating chamber 1, on which is provided an antenna 19 of a magnetron 9 and a stark 20 for stirring the electric field within the heating chamber.

Reference numeral 21 denotes a windmill that generates rotational power for the starve 200, which is rotated by air supplied from a fluid control element 22, which is an air inflow circuit described later.

A partition plate 23 is made of a material with low high-frequency power loss and isolates the magnetron antenna 19 and the stark 20 from food waste and water vapor.

This partition plate also acts so as not to disturb the airflow in the heating chamber when the stirrer rotates 200 times.

Incidentally, the fluid control element 22 in this embodiment is of a so-called proportional amplification type in which the controlled amount changes proportionally depending on the strength of the trigger.

The proportional amplification type fluid control element 22 is shown in FIG. 6. In FIG. ing.

Reference numeral 24 denotes a first outflow path, and the downstream side thereof communicates with the flow path 25 in which the wind turbine is provided.

Reference numeral 26 denotes a second outflow path, which communicates with the heating chamber 1 on the downstream side via the air inflow opening 5 of the heating chamber 1 and the guide plate 17 section.

27 is a trigger flow path, and a butterfly valve 28 is installed in the flow path 27.
is provided, and its terminal end is connected to the outside of the high-frequency heating device.

The butterfly valve 28 is connected to the power supply device 16 controlled by the automatic control device 15, and when the temperature detection mechanism detects a temperature rise value corresponding to the upper limit T3 of the temperature of the heated object, the butterfly valve 28 is connected to the power supply device 16 controlled by the automatic control device 15. The trigger channel 27 is controlled to communicate with the atmosphere outside the high frequency heating device.

FIG. 6 shows the butterfly valve 28 in an open state.

Further, 8a is an exhaust path that guides the air that has finished circulating through the heating chamber 1 to a flow path 25 that leads to the blower device 7.

In this device, all of the air sucked in by the blower 7 cools the magnetron 9, and is then discharged to the outside of the high-frequency heating device.

Next, the operation of the high frequency heating device configured as described above will be explained.

First, from the start of high-frequency heating until the temperature of the object to be heated 2 reaches the upper limit T3 of the set temperature, the butterfly valve 28 is closed as shown in FIG. 5, and the air sucked by the blower 7 is opened. 10 to the main inflow channel 2 of the fluid control element 22
3, most of it flows into the first outflow path 24.
It flows through the flow path 25 in which the windmill 21 is provided, rotates the windmill 21, and then reaches the block 7.

Then, only a small portion of the air that has flowed into the main inflow path 23 flows into the second outflow path 26 connected to the heating chamber 1, flows into the heating chamber 1, comes into contact with the object to be heated 2, and is heated. The steam generated from the heated object 2 is drawn in and reaches the opening 6, and flows out into the flow path 25 through the exhaust path 8a.

In this state where the butterfly valve 28 is closed, the amount of air supplied to the heating chamber 1 through the second outflow path 26 is an amount Q1 convenient for temperature detection.

During this time, the windmill 21 is rotated well by the large amount of air flowing, and therefore the stirrer 20 is rotated in a state necessary and sufficient for uniformly heating the object 2 to be heated.

Here, when the temperature rise value of the air flowing out from the opening 6 of the heating chamber 1 reaches a value corresponding to the upper limit T3 of the set temperature of the object to be heated 2, the automatic control device 15 operates and the magnetron 9
At the same time as stopping the 0-shot vibration operation, the temperature detection position of the temperature detection mechanism is released, and the butterfly valve 28 of the fluid control element 22 is opened.

That is, the state shown in FIG. 5 changes to the state shown in FIG.

Note that since the flow of air within the fluid control element 22 is caused by the suction action of the blower 7 provided at the most downstream part of the flow path, the air pressure inside the fluid control element 22 is lower than atmospheric pressure. When the butterfly valve 28 opens, the atmosphere passes through the trigger flow path 27 and enters the fluid control element 2.
It will flow into 2.

In this embodiment, the capacity of the blower 7 is constant regardless of whether the magnetron 9 is ON or OFF, so when the butterfly valve 28 opens and the trigger air flows in from there, it naturally opens. The amount of air flowing into the main inflow path 23 from the heating chamber 10 decreases, and this also greatly helps, the air in the main inflow path 23 tilts its streamline toward the second outflow path 26 side, and the amount of air flowing into the heating chamber 1 is reduced. quantity Q, to Q
Increase to 2.

As a result, the atmosphere in the heating chamber that is prone to condensation is quickly discharged from the heating chamber 1, and is discharged through the exhaust path 8a and the blower I to the outside of the high-frequency heating apparatus.

At this time, since the amount of air flowing through the flow path 25 decreases, the number of rotations of the wind turbine 210 decreases somewhat or considerably, but since high frequency heating is not being performed at this point, even heating etc. It won't be a problem.

When the time t1 of the cycle in which the amount of air flowing through the heating chamber 1 is increased Q2 has elapsed, the automatic control device 15
Then, the butterfly valve 28 is closed, the triggering of the fluid control element 22 is stopped, and the amount of air flowing into the heating chamber 1 through the second outflow path 26 is returned to the original Ql, so that the state is favorable for temperature detection. fix.

Then, time t2 has elapsed since the air amount returned from Q2 to Ql, that is, the flow of air flowing through the heating chamber 1 becomes a steady flow, and the temperature of the air flowing out from the opening 6 of the heating chamber 1 increases. When the value accurately reflects the temperature of the object 2 to be heated, the temperature detection mechanism enters the detection mode, and when the temperature rise value becomes a value corresponding to the lower limit T2 of the set temperature of the object 2 to be heated, Then, the automatic control device 15 operates to cause the magnetron 9 to operate in oscillation again to resume high-frequency heating.

When the temperature detection mechanism detects a predetermined value again, it stops the magnetron 90 oscillation operation, releases the temperature detection position, and triggers the fluid control element 22 to control the heating chamber 1.
This is to exhaust the internal atmosphere.

The present invention thus provides a high-frequency heating device that indirectly detects the temperature of the object to be heated based on the temperature of the air inside the heating chamber or the temperature of the air flowing out from the heating chamber, and automatically controls high-frequency heating. Even when the temperature of the heated object is kept at a predetermined value for a certain period of time while detecting the temperature,
No dew condensation occurs on the heating chamber walls or finder, and various adverse effects caused by dew condensation can be almost completely eliminated.

Furthermore, according to the present invention, magnetron cooling, ventilation in the heating chamber, and rotation of the star 2 can be performed with a single blower, and even if the amount of air circulating in the heating chamber is increased or decreased, the magnetron remains Since there are no large fluctuations in the amount of air supplied, it is highly effective in maintaining stable performance of the high-frequency heating device and reducing product prices.

In addition, in the above-mentioned example, when increasing the amount of air circulating in the heating chamber, the atmosphere outside the high-frequency heating device was used, but some of the warm air after cooling the magnetron etc. was mixed in. You may use it.

In this way, even if the absolute amount of circulating air is small, it is effective in lowering the water vapor saturation point of the atmosphere in the heating chamber, and even if condensation occurs, it can be removed.

Such use of hot air can be easily achieved by forming an air path connecting the magnetron section and the trigger flow path section of the fluid control element as appropriate.

Alternatively, as a means of obtaining hot air, as mentioned above,
In addition to using hot air after cooling a heating element such as a magnetron, the air flowing into the heating chamber may be directly heated.

However, when using hot air in this way, the heating chamber wall,
It is important to keep the finder, temperature sensing element, etc. from heating up. To this end, the rate of hot air mixing, hot air temperature, or hot air supply time must be appropriately determined to prevent subsequent temperature detection. must be avoided so as not to have a negative impact on

In addition, in the explanation of the embodiment, when the temperature of the heated object reaches the upper limit of the set temperature, the oscillation operation of the magnetron is stopped and high frequency heating is completely stopped. Heating may be continued by lowering the high frequency power to such an extent that the temperature of the object to be heated does not drop suddenly.

In this case, the number of times of heating using high-output radio-frequency power is reduced, which may be advantageous depending on the type of the object to be heated.

In addition, as the heating of the object to be heated progresses, including the case where heating is performed by lowering the high-frequency power as described above, if there is a qualitative change in the object to be heated, the temperature rise characteristics of the object to be heated (
Differences occur in the slope of the temperature rise curve) and temperature drop characteristics, and the length of the cycle of increase/decrease in the amount of air circulating in the heating chamber also changes.
3. There will be a difference such as t3'.

In such a case, the atmosphere in the heating chamber may reach a saturation point before the next increase in the amount of air flowing through the heating chamber occurs.

In order to eliminate this instinct, depending on the temperature rise or fall characteristics of the heated object, the automatic control device is made to understand this and performs an appropriate increase cycle between the previous increase cycle and the next increase cycle. It may be set to prevent dew condensation within the heating chamber.

Further, the above-mentioned increase cycle may be added by operating a humidity detection mechanism other than by determining the temperature rise or fall characteristics of the heated object.

In such a case, the temperature detection mechanism should be released from the temperature detection position during the increasing cycle of circulating air, and a sufficient amount of time should be allowed for the circulating air flow to reach a steady state before entering the temperature detection position. need to wait.

Further, in the embodiment, the blower is of a suction type provided at the most downstream position of the air flow path, but conversely, the blower may be provided at the most upstream position of the air flow path.

In this case, the trigger channel of the fluid control element needs to be connected to a portion of the blower outlet where the pressure distribution is high.

Furthermore, the fluid control element may be triggered in a negative manner by sucking air out, instead of in a positive manner by injecting air as in the embodiment.

Further, the valve device provided in the trigger flow path is not limited to the butterfly valve of the embodiment, but may be any device as long as it can open and close the flow path.

Note that if it is necessary to adjust the trigger amount to change the amount of increase in the amount of air circulating in the heating chamber, it is also possible to provide the automatic control device with this function and control the opening degree of the valve device.

The present invention has been described above in which the temperature of the air inside the heating chamber or the temperature of the air flowing out from the heating chamber is detected to automatically control the heating of the object to be heated. It is also possible to automatically control the heating in the same way by detecting the humidity or the humidity of the air flowing out from the heating chamber.

Note that when detecting the humidity of the air in the heating chamber, it is necessary to prevent the detecting element from being exposed to high frequency power, as in the case of detecting temperature.

If the detection element is to be exposed to high-frequency power and used, care should be taken to ensure that it does not adversely affect users or control equipment outside the heating chamber.
consideration must be given.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view of a general temperature-sensing type high-frequency heating device, Figure 2 is a diagram showing the relationship between the amount of air flowing in the heating chamber and the temperature rise value of the air flowing out of the heating chamber, and Figure 3 The figure is a conceptual diagram of the temperature change when the heated object is maintained at a predetermined temperature, and Figure 4 shows the interlocking state of the increase/decrease cycle of the amount of air circulating in the heating chamber when the temperature of the heated object is controlled as shown in Figure 3. 5 is a schematic cross-sectional view of the high-frequency heating device of the present invention, and FIG. 6 is a cross-sectional view showing only the main parts of FIG.
This shows an operating state different from the one shown in the figure. 1: Heating chamber, 2: Heated object, 3: Door, 5, 6: Heating chamber opening, 7: Blower device, 8a: Exhaust path, 13.14: Temperature detection element, 15: Automatic control device, 16: Power supply device, 1
7: Guide plate, 20: Stark, 21: Windmill, 22: Proportional amplification type fluid control element, 23: Main inflow path, 24: First outflow path, 25: Flow path, 26: Second outflow path, 27: Trigger Channel, 28: Butterfly valve.

Claims (1)

[Claims] 1. While the object to be heated in the heating chamber is being high-frequency heated by the oscillation of the magnetron, the temperature of the air in the heating chamber or the temperature of the air flowing out from the heating chamber is detected by a temperature detection mechanism, In devices that automatically control heating, when the temperature of the heated object is maintained within a predetermined temperature range for a certain period of time, when the temperature of the air reaches a preset value, the high frequency power is controlled and a fluid control element is used. A high-frequency heating device characterized by increasing or decreasing the amount of air circulating within a heating chamber. 2. The high-frequency heating device according to claim 1, wherein the fluid control element is a proportional amplification type fluid control element. 3 In claim 1, the fluid control element is:
The upstream side of the main inflow path is connected to the atmosphere outside the high-frequency heating device, the downstream side of the first outflow path is connected to the blower device via a flow path provided with a windmill for driving stirrer rotation, and the downstream side of the second outflow path is connected to the heating chamber and A high-frequency heating device characterized in that the high-frequency heating device is connected to a blower device through an exhaust path, and the upstream side of the trigger flow path is connected to the atmosphere outside the high-frequency heating device through a valve device. 4. The high-frequency heating device according to claim 1, wherein the fluid control element is provided with a valve device in its trigger flow path, the opening and closing of which is controlled by an automatic control device. 5 In claim 1, the length of the increasing cycle among the cycles for increasing and decreasing the amount of air flowing in the heating chamber includes at least the time required for exhausting air equivalent to the internal volume of the heating chamber. A high frequency heating device characterized in that it is time. 6 In claim 1, the length of the increasing cycle among the cycles for increasing and decreasing the amount of air flowing in the heating chamber is the time that includes the time necessary for exhausting the atmosphere in the heating chamber. A high frequency heating device characterized by the following. 7 In any one of claims 1 to 6, among the cycles for increasing and decreasing the amount of air flowing in the heating chamber, the increasing cycle is when the oscillation operation of the magnetron stops and the temperature sensing mechanism changes its detection position. A high-frequency heating device characterized by being accompanied by release. 8 In any one of claims 1 to 6, the temperature detection performed during the decreasing cycle of the cycle of increasing and decreasing the amount of air flowing in the heating chamber is performed when the air flow state in the heating chamber is a steady flow. The high-frequency heating device is characterized in that the heating is performed after the temperature of the object to be heated is reliably reflected in the temperature change of the air flowing out from the heating chamber. 9. The high-frequency heating device according to claim 1, wherein among the cycles for increasing and decreasing the amount of air flowing in the heating chamber, the increasing cycle is performed by adding temperature. 10. The high-frequency heating device according to claim 1, wherein among the cycles for increasing and decreasing the amount of air flowing in the heating chamber, the increasing cycle is performed by heating the air flowing into the heating chamber. 11 In any one of claims 1 to 6, among the cycles for increasing and decreasing the amount of air circulating in the heating chamber, the increasing cycle is such that the circulating air is appropriately stratified and the manner in which it is heated is reversed. A high-frequency heating device characterized in that it does not adversely affect subsequent temperature detection.